329 



bicular spot on the front and the region of the ocelli, black; eyes brown; 

 first, second and third joints of the antenna) whitish, remainder fuscous, 

 pilose; tips of the palpi fuscous. Mesothorax with three black spots, of 

 which the central one is orbicular, and the lateral ones reniform. Base of 

 the scutellura (of the mesothorax) black. Metathorax with four small 

 black spots in a transverse series, and a larger, quadrate, black spot on the 

 middle of the posterior margin,* with two black spots above the articulations 

 of the intermediate and posterior coxae. Wings hyaline, somewhat irides- 

 cent; superior ones with the circumscribing nervure of the stigma, a small 

 spot on the middle of the costal edge, and another on the posterior margin 

 nearer the base, black. Abdomen with the incisures above edged with 

 black, a dorsal series of black triangles, and on each side two lateral series 

 of abbreviated, transverse, black lines; apex with three larger, subquadrate, 

 black spots. 



The black spots on the head, thorax, and tip of the abdomen, are highly 

 polished. The circumscribing nervure of the stigma at base, the bifurca- 

 tion of the nervures near the middle of the wing, and the transverse anas- 

 tomosing nervure from the central areole to the inner margin are white. 

 The wings are so perfectly hyaline, as not to be visible at a short distance. 



Allied to P. bipunctaius Fabr. and Latr. (see Coquebert, Decas i, p. 11, 

 Tab. 2, fig. 3), but evidently larger, and otherwise distinct. 



Psocus gregarius Harr. Catal. [P. venosus Burm.] 



Fuscous; superior wings black, opaque; stigma and nervures, together 

 with the incisures of the abdomen, yellow; feet pale. Length to the tip of 

 the closed wings .37 iii. Gregarious on the trunks of trees, sometimes on 

 fences. Milton, August 1, 1829. Cambridge, Sept. 7, 1837. 



Body fuscous; head, anterior part of thorax and legs paler; antennae 

 rather longer than the wings, simjile, blackish; palpi, two terminal joints 

 blackish; an orbicular, black, glabrous spot on the anterior part of the 

 mesothorax; hinder margins of the mesothorax and metathorax yellow; 

 upper wings black, opaque, the large, longitudinal nervures from the base 

 to beyond the middle, and the greater ^lart of the costal stigma pale yellow; 

 under wings pale fuscous, diaphanous; abdomen dark fuscous, or black 

 above, with yellow incisures; each of the segments beneath with a pale 

 cinereous, transverse band; legs pale, or whitish; tibiae above and tarsi 

 fuscous. 



This is our largest species. The yellow nervures of the upper wings 

 present a metallic lustre in perfectly mature specimens. It differs entirely 

 from all the species described by Fabricius and Latreille. 



